Compositions containing 1,1,1,3,3-pentachloropropane

ABSTRACT

The invention first relates to a composition comprising at least 99 wt. % of 1,1,1,3,3ºpentachloropropane and at least one compound selected from a list of additional compounds consisting of dichloropropanes, trichloropropanes, tetrachloropropanes, pentachloropropanes different from 1,1,1,3,3ºpentachloropropane, hexachloropropanes, heptachloropropanes, chloropropenes, dichloropropenes, trichloropropenes, tetrachloropropenes, pentachloropropenes and hexachloropropene, the weight content of said compound in the composition being lower than or equal to 500 ppm.

CROSSºREFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.15/518,607, filed Apr. 12, 2017, which is a U.S. National Stageapplication of International Application No. PCT/FR2015/052694, filedOct. 7, 2015, which claims the benefit of French Application No.1459928, filed Oct. 16, 2014.

FIELD OF THE INVENTION

The present invention relates to compositions based on Fº240fa(1,1,1,3,3ºpentachloropropane) and also to the use thereof especiallyfor producing Fº1233zdE (transº1ºchloroº3,3,3ºtrifluoropropene) and/orFº1234zeE (transº1,3,3,3ºtetrafluoropropene).

TECHNICAL BACKGROUND

Fluoroolefins Fº1233zdE and Fº1234zeE are compounds of major interestfor refrigeration and air conditioning systems, given the newenvironmental regulations.

It is known practice to produce hydrofluoroolefins such as Fº1233zdEand/or by fluorination of hydrochloroolefins or chlorohydrocarbons,especially. This fluorination is generally a catalytic fluorinationusing hydrofluoric acid as fluorinating agent.

Among the routes for obtaining Fº1233zdE, it is in particular knownpractice to use Fº240fa (1,1,1,3,3ºpentachloropropane) as startingcompound. Reference is made, for example, to U.S. Pat. No. 8,704,017 inthis respect, which describes a process for fluorination in the liquidphase in the absence of catalyst.

Another possible process is gasºphase fluorination in the presence of acatalyst and of an oxidizing agent, such as chlorine, for example, inorder to maintain the stability of the catalyst.

Furthermore, it is known to use the compound Fº1233zdE for thesuccessive production of Fº1234zeE. Reference is made, for example, toU.S. Pat. No. 5,895,825 in this respect.

It is desirable to be able to produce Fº1233zdE with a low content ofimpurities. In particular, the formation of certain toxic and/orflammable impurities and/or impurities liable to polymerize and/orimpurities that are difficult to separate from Fº1233zdE should beminimized.

It is also desirable to be able to produce Fº1234zeE with a low contentof impurities.

In particular, the formation of certain toxic impurities and/orimpurities liable to polymerize and/or impurities that are difficult toseparate from Fº1234zeE should be minimized.

There is thus a need to provide means for obtaining Fº1233zdE andFº1234zeE compositions of satisfactory purity.

SUMMARY OF THE INVENTION

The invention relates firstly to a composition comprising at least 99%by weight of 1,1,1,3,3ºpentachloropropane, and comprising at least onecompound chosen from a list of additional compounds consisting ofdichloropropanes, trichloropropanes, tetrachloropropanes,pentachloropropanes other than 1,1,1,3,3ºpentachloropropane,hexachloropropanes, heptachloropropanes, chloropropenes,dichloropropenes, trichloropropenes, tetrachloropropenes,pentachloropropenes and hexachloropropene, said compound being presentin the composition in a weight content of less than or equal to 500 ppm.

According to one embodiment, said compound is present in the compositionin a weight content of less than or equal to 250 ppm; preferably lessthan or equal to 150 ppm; more particularly less than or equal to 100ppm; more particularly less than or equal to 50 ppm; and ideally lessthan or equal to 10 ppm.

According to one embodiment, the composition comprises a plurality ofcompounds chosen from said list of additional compounds, each of thecompounds of said plurality of compounds being present in thecomposition in a weight content of less than or equal to 500 ppm;preferably less than or equal to 250 ppm; preferably less than or equalto 150 ppm; more particularly less than or equal to 100 ppm; moreparticularly less than or equal to 50 ppm; and ideally less than orequal to 10 ppm.

According to one embodiment, the composition comprises a plurality ofcompounds chosen from said list of additional compounds, the totalweight content of all of the compounds of said list being less than orequal to 1000 ppm; preferably less than or equal to 500 ppm; preferablyless than or equal to 250 ppm; preferably less than or equal to 150 ppm;more particularly less than or equal to 100 ppm; more particularly lessthan or equal to 50 ppm; and ideally less than or equal to 10 ppm.

According to one embodiment, the composition comprises at least 99.5% byweight, preferably at least 99.8% by weight, and more particularlypreferably at least 99.9% by weight, of 1,1,1,3,3ºpentachloropropane.

According to one embodiment, the composition comprises at least onecompound chosen from the group consisting of hexachloropropene andheptachloropropanes, and the weight content of each of these compoundsin the composition is less than or equal to 500 ppm, preferably lessthan or equal to 200 ppm, more particularly less than or equal to 100ppm and ideally less than or equal to 50 ppm; and optionally, the totalweight content of the compounds of this group in the composition is lessthan or equal to 500 ppm, preferably less than or equal to 200 ppm, moreparticularly less than or equal to 100 ppm and ideally less than orequal to 50 ppm.

According to one embodiment, the composition comprises at least onecompound chosen from the group consisting of pentachloropropenes andhexachloropropanes, and the weight content of each of these compounds inthe composition is less than or equal to 500 ppm, preferably less thanor equal to 200 ppm, more particularly less than or equal to 100 ppm andideally less than or equal to 50 ppm; and, optionally, the total weightcontent of the compounds of this group in the composition is less thanor equal to 500 ppm, preferably less than or equal to 200 ppm, moreparticularly less than or equal to 100 ppm and ideally less than orequal to 50 ppm.

According to one embodiment, the composition comprises at least onecompound chosen from the group consisting of tetrachloropropenes andpentachloropropanes other than 1,1,1,3,3ºpentachloropropane, and theweight content of each of these compounds in the composition is lessthan or equal to 500 ppm, preferably less than or equal to 200 ppm, moreparticularly less than or equal to 100 ppm and ideally less than orequal to 50 ppm; and, optionally, the total weight content of thecompounds of this group in the composition is less than or equal to 500ppm, preferably less than or equal to 200 ppm, more particularly lessthan or equal to 100 ppm and ideally less than or equal to 50 ppm.

According to one embodiment, the composition comprises at least onecompound chosen from the group consisting of 2,3,3,3ºtetrachloropropene,1,1,2,3ºtetrachloropropene, 1,1,1,2,3ºpentachloropropane,1,1,2,2,3ºpentachloropropane and 1,1,1,2,2ºpentachloropropane, and theweight content of each of these compounds in the composition is lessthan or equal to 500 ppm, preferably less than or equal to 200 ppm, moreparticularly less than or equal to 100 ppm and ideally less than orequal to 50 ppm; and, optionally, the total weight content of thecompounds of this group in the composition is less than or equal to 500ppm, preferably less than or equal to 200 ppm, more particularly lessthan or equal to 100 ppm and ideally less than or equal to 50 ppm.

According to one embodiment, the composition comprising at least onecompound chosen from the group consisting of trichloropropenes andtetrachloropropanes, and the weight content of each of these compoundsin the composition is less than or equal to 500 ppm, preferably lessthan or equal to 200 ppm, more particularly less than or equal to 100ppm and ideally less than or equal to 50 ppm; and, optionally, the totalweight content of the compounds of this group in the composition is lessthan or equal to 500 ppm, preferably less than or equal to 200 ppm, moreparticularly less than or equal to 100 ppm and ideally less than orequal to 50 ppm.

According to one embodiment, the composition comprises at least onecompound chosen from the group consisting of 1,1,3ºtrichloropropene,3,3,3ºtrichloropropene, 1,1,1,3ºtetrachloropropane,1,1,2,3ºtetrachloropropane and 1,1,1,2ºtetrachloropropane, and theweight content of each of these compounds in the composition is lessthan or equal to 500 ppm, preferably less than or equal to 200 ppm, moreparticularly less than or equal to 100 ppm and ideally less than orequal to 50 ppm; and, optionally, the total weight content of thecompounds of this group in the composition is less than or equal to 500ppm, preferably less than or equal to 200 ppm, more particularly lessthan or equal to 100 ppm and ideally less than or equal to 50 ppm.

The invention also relates to a process for producing1,3,3,3ºtetrafluoropropene, especially in trans form, comprising:

-   -   the provision of a composition as defined above;    -   the reaction of this composition with hydrofluoric acid,        preferably in the gas phase.

According to one embodiment, the process comprises a single step ofcatalytic fluorination.

According to one embodiment, the process comprises two successive stepsof catalytic fluorination, namely:

-   -   the reaction of the composition with hydrofluoric acid in the        gas phase, to manufacture an intermediate product;    -   optionally, purification of the intermediate product; and then    -   reaction of the intermediate product with hydrofluoric acid in        the gas phase, to manufacture 1,3,3,3ºtetrafluoropropene;

the intermediate product preferably being1ºchloroº3,3,3ºtrifluoropropene, especially in trans form.

The present invention makes it possible to overcome the drawbacks of theprior art. It more particularly provides compositions based on Fº240fa,the content of impurities of which makes it possible to minimize thepresence of harmful impurities in Fº1233zdE or in Fº1234zeE manufacturedtherefrom.

Specifically, the impurities present in Fº1233zdE or in Fº1234zeE arepartly dependent on the impurities initially present in the Fº240fawhich is used to manufacture them. In the course of the fluorinationreaction(s), some of the impurities of Fº240fa may be converted intodifferent impurities in Fº1233zdE or in Fº1234zeE. Controlling theimpurities present in Fº240fa thus makes it possible indirectly tocontrol the impurities present in Fº1233zdE and in Fº1234zeE.

Such an indirect control may be advantageous insofar as the impuritiesof Fº1233zdE may be more difficult to separate from Fº1233zdE than theimpurities of Fº240fa relative to Fº240fa; and insofar as the impuritiesof Fº1234zeE may be more difficult to separate from Fº1234zeE than theimpurities of Fº240fa relative to Fº240fa. This is especially the casewhen the impurities of Fº1233zdE (respectively the impurities ofFº1234zeE) have a very close boiling point or form an azeotrope or aquasiºazeotrope with Fº1233zdE (respectively Fº1234zeE).

DESCRIPTION OF EMBODIMENTS OF THE INVENTION

The invention is now described in greater detail and in a nonlimitingmanner in the description that follows.

All the contents indicated are weight contents, unless otherwisementioned.

NOMENCLATURE

The table below gives the nomenclature of a certain number of compoundsthat are included in the invention.

Formula Notation Full name CCl₃°CHCl°CCl₃ F°220da1,1,1,2,3,3,3°heptachloropropane CHCl₂°CCl₂°CCl₃ F°220aa1,1,1,2,2,3,3°heptachloropropane CF₃°CHCl°CF₃ F°226da2°chloro°1,1,1,3,3,3°hexafluoropropane CF₃°CHF°CClF₂ F°226ea1°chloro°1,1,2,3,3,3°hexafluoropropane CF₃°CFCl°CHF₂ F°226ba2°chloro°1,1,2,3,3,3°hexafluoropropane CF₃°CF₂°CHFCl F°226ca3°chloro°1,1,1,2,2,3°hexafluoropropane CClF₂°CF₂°CHF₂ F°226cb1°chloro°1,1,2,2,3,3°hexafluoropropane CCl₃°CH₂°CCl₃ F°230fa1,1,1,3,3,3°hexachloropropane CHCl₂°CHCl°CCl₃ F°230da1,1,1,2,3,3°hexachloropropane CHCl₂°CCl₂°CHCl₂ F°230aa1,1,2,2,3,3°hexachloropropane CH₂Cl°CCl₂°CCl₃ F°230ab1,1,1,2,2,3°hexachloropropane CF₃°CH₂°CF₃Cl F°235fa3°chloro°1,1,1,3,3°pentafluoropropane CF₃°CHF°CHFCl F°235ea1°chloro°1,2,3,3,3°pentafluoropropane CHF₂°CHF°CClF₂ F°235eb1°chloro°1,1,2,3,3°pentafluoropropane CHClF°CF₂°CHF₂ F°235ca3°chloro°1,1,2,2,3°pentafluoropropane CH₂Cl°CF₂°CF₃ F°235cb3°chloro°1,1,1,2,2°pentafluoropropane CH₂F°CF₂°CClF₂ F°235cc1°chloro°1,1,2,2,3°pentafluoropropane CHF₂°CHCl°CF₃ F°235da2°chloro°1,1,1,3,3°pentafluoropropane CHF₂°CClF°CHF₂ F°235ba2°chloro°1,1,2,3,3°pentafluoropropane CH₂F°CClF°CF₃ F°235bb2°chloro°1,1,1,2,3°pentafluoropropane CF₃°CH₂°CF₃ F°236fa1,1,1,3,3,3°hexafluoropropane CHF₂°CF₂°CHF₂ F°236ca1,1,2,2,3,3°hexafluoropropane CH₂F°CF₂°CF₃ F°236cb1,1,1,2,2,3°hexafluoropropane CHF₂°CHF°CF₃ F°236ea1,1,1,2,3,3°hexafluoropropane CHCl₂°CH₂°CCl₃ F°240fa1,1,1,3,3°pentachloropropane CHCl₂°CHCl°CHCl₂ F°240da1,1,2,3,3°pentachloropropane CH₂Cl°CHCl°CCl₃ F°240db1,1,1,2,3°pentachloropropane CH₂Cl°CCl₂°CHCl₂ F°240aa1,1,2,2,3°pentachloropropane CH₃°CCl₂°CCl₃ F°240ab1,1,1,2,2°pentachloropropane CH₂F°CF₂°CHF₂ F°245ca1,1,2,2,3°pentafluoropropane CF₃°CF₂°CH₃ F°245cb1,1,1,2,2°pentafluoropropane CHF₂°CHF°CHF₂ F°245ea1,1,2,3,3°pentafluoropropane CH₂F°CHF°CF₃ F°245eb1,1,1,2,3°pentafluoropropane CHF₂°CH₂°CF₃ F°245fa1,1,1,3,3°pentafluoropropane CHCl₂°CH₂°CHCl₂ F°250fa1,1,3,3°tetrachloropropane CH₂Cl°CH₂°CCl₃ F°250fb1,1,1,3°tetrachloropropane CH₂Cl°CHCl°CHCl₂ F°250da1,1,2,3°tetrachloropropane CH₃°CHCl°CCl₃ F°250db1,1,1,2°tetrachloropropane CH₂Cl°CCl₂°CH₂Cl F°250aa1,2,2,3°tetrachloropropane CH₃°CCl₂°CHCl₂ F°250ab1,1,2,2°tetrachloropropane CF₂Cl°CH₂°CH₂F F°253fa1°chloro°1,1,3°trifluoropropane CH₂Cl°CH₂°CF₃ F°253fb1°chloro°3,3,3°trifluoropropane CF₂Cl°CH₂°CH₂F F°253fc1°chloro°1,1,3°trifluoropropane CH₂F°CClF°CH₂F F°253ba2°chloro°1,2,3°trifluoropropane CHF₂°CClF°CH₃ F°253bb2°chloro°1,1,2°trifluoropropane CH₂Cl°CF₂°CH₂F F°253ca1°chloro°2,2,3°trifluoropropane CHFCl°CF₂°CH₃ F°253cb1°chloro°1,2,2°trifluoropropane CHF₂°CHF°CH₂Cl F°253ea3°chloro°1,1,2°trifluoropropane CHClF°CHF°CH₂F F°253eb1°chloro°1,2,3°trifluoropropane CClF₂°CHF°CH₃ F°253ec1°chloro°1,1,2°trifluoropropane CH₂Cl°CH₂°CHCl₂ F°260fa1,1,3°trichloropropane CH₃°CH₂°CCl₃ F°260fb 1,1,1°trichloropropaneCH₂Cl°CHCl°CH₂Cl F°260da 1,2,3°trichloropropane CH₃°CHCl°CHCl₂ F°260db1,1,2°trichloropropane CH₃°CCl₂°CH₂Cl F°260aa 1,2,2°trichloropropaneCH₂°Cl°CH₂°CH₂Cl F°270fa 1,3°dichloropropane CH₃°CH₂CHCl₂ F°270fb1,1°dichloropropane CH₃°CHCl°CH₂Cl F°270da 1,2°dichloropropaneCH₃°CCl₂°CH₃ F°270aa 2,2°dichloropropane CCl₃°CCl═CCl₂ F°1210xahexachloropropene CF₃°CCl═CCl₂ F°1213xa1,1,2°trichloro°3,3,3°trifluoropropene CF₂Cl°CCl═CFCl F°1213xb1,2,3°trichloro°1,3,3°trifluoropropene CFCl₂°CCl═CF₂ F°1213xc2,3,3°trichloro°1,1,3°trifluoropropene CCl₃°CF═CF₂ F°1213yc3,3,3°trichloro°1,1,2°trifluoropropene CFCl₂°CF═CFCl F°1213yb1,3,3°trichloro°1,2,3°trifluoropropene CF₂Cl°CF═CCl₂ F°1213ya1,1,3°trichloro°2,3,3°trifluoropropene CCl₂F°CF═CF₂ F°1214yc3,3°dichloro°1,1,2,3°tetrafluoropropene CClF₂°CCl═CF₂ F°1214xc2,3°dichloro°1,1,3,3°tetrafluoropropene CClF₂°CF═CFCl F°1214yb1,3°dichloro°1,2,3,3°tetrafluoropropene CF₃°CCl═CFCl F°1214xb1,2°dichloro°1,3,3,3°tetrafluoropropene CF₃°CF═CCl₂ F°1214ya1,2°dichloro°2,3,3,3°tetrafluoropropene CF₃°CCl═CF₂ F°1215xc2°chloro°1,1,3,3,3,°pentafluoropropene CF₂°Cl°CF═CF₂ F°1215yc3°chloro°1,1,2,3,3,°pentafluoropropene CF₃°CF═CFCl F°1215yb1°chloro°1,2,3,3,3,°pentafluoropropene CF₃°CF═CF₂ F°1216ychexafluoropropene CHCl₂°CCl═CCl₂ F°1220xa 1,1,2,3,3°pentachloropropeneCCl₃°CCl═CHCl F°1220xd 1,2,3,3,3°pentachloropropene CCl₃°CH═CCl₂F°1220za 1,1,3,3,3°pentachloropropene CF₃°CCl═CHCl F°1223xd1,2°dichloro°3,3,3°trifluoropropene CF₂Cl°CCl═CHF F°1223xe2,3°dichloro°1,3,3°trifluoropropene CHFCl°CCl═CF₂ F°1223xc2,3°dichloro°1,1,3°trifluoropropene CFCl₂°CH═CF₂ F°1223zc3,3°dichloro°1,1,3°trifluoropropene CF₂Cl°CH═CFCl F°1223zb1,3°dichloro°1,3,3°trifluoropropene CF₃°CH═CCl₂ F°1223za1,1°dichloro°3,3,3°trifluoropropene CHF₂°CF═CCl₂ F°1223ya1,1°dichloro°2,3,3°trifluoropropene CF₂Cl°CF═CHCl F°1223yd1,3°dichloro°2,3,3°trifluoropropene CFCl₂°CF═CHF F°1223ye3,3°dichloro°1,2,3°trifluoropropene CHCl₂°CF═CF₂ F°1223yc3,3°dichloro°1,1,2°trifluoropropene CHFCl°CF═CF₂ F°1224yc3°chloro°1,1,2,3°tetrafluoropropene CHF₂°CCl═CF₂ F°1224xc2°chloro°1,1,3,3°tetrafluoropropene CF₂Cl°CH═CF₂ F°1224zc3°chloro°1,1,3,3°tetrafluoropropene CHF₂°CF═CFCl F°1224yb1°chloro°1,2,3,3°tetrafluoropropene CF₃°CH═CFCl F°1224zb1°chloro°1,3,3,3°tetrafluoropropene CClF₂°CF═CHF F°1224ye3°chloro°1,2,3,3°tetrafluoropropene CF₃°CCl═CHF F°1224xe2°chloro°1,3,3,3°tetrafluoropropene CF₃°CF═CHCl F°1224yd1°chloro°2,3,3,3°tetrafluoropropene CF₃°CH═CF₂ F°1225zc1,1,3,3,3°pentafluoropropene CHF₂°CF═CF₂ F°1225yc1,1,2,3,3°pentafluoropropene CF₃°CF═CHF F°1225ye1,2,3,3,3°pentafluoropropene CH₂Cl°CCl═CCl₂ F°1230xa1,1,2,3°tetrachloropropene CHCl₂°CCl═CHCl F°1230xd1,2,3,3°tetrachloropropene CCl₃°CCl═CH₂ F°1230xf2,3,3,3°tetrachloropropene CHCl₂°CH═CCl₂ F°1230za1,1,3,3°tetrachloropropene CCl₃°CH═CHCl F°1230zd1,3,3,3°tetrachloropropene CF₃°CCl═CH₂ F°1233xf2°chloro°3,3,3°trifluoropropene CClF₂°CF═CH₂ F°1233yf3°chloro°2,3,3°trifluoropropene CHF₂°CF═CHCl F°1233yd1°chloro°2,3,3°trifluoropropene CF₃°CH═CHCl F°1233zd1°chloro°3,3,3°trifluoropropene CHF₂°CCl═CHF F°1233xe2°chloro°1,3,3°trifluoropropene CHClF°CF═CHF F°1233ye3°chloro°1,2,3°trifluoropropene CClF₂°CH═CHF F°1233ze3°chloro°1,3,3°trifluoropropene CH₂Cl°CF═CF₂ F°1233yc3°chloro°1,1,2°trifluoropropene CFH₂°CCl═CF₂ F°1233xc2°chloro°1,1,3°trifluoropropene CFClH°CH═CF₂ F°1233zc3°chloro°1,1,3°trifluoropropene CFH₂°CF═CFCl F°1233yb1°chloro°1,2,3°trifluoropropene CF₂H°CH═CFCl F°1233zb1°chloro°1,3,3°trifluoropropene CF₃°CF═CH₂ F°1234yf2,3,3,3°tetrafluoropropene CF₃°CH═CHF F°1234ze1,3,3,3°tetrafluoropropene CH₂F°CF═CF₂ F°1234yc1,1,2,3°tetrafluoropropene CHF₂°CH═CF₂ F°1234zc1,1,3,3°tetrafluoropropene CHF₂°CF═CHF F°1234ye1,2,3,3°tetrafluoropropene CH₃°CCl═CCl₂ F°1240xa 1,1,2°trichloropropeneCH₂Cl°CCl═CHCl F°1240xd 1,2,3°trichloropropene CHCl₂°CCl═CH₂ F°1240xf2,3,3°trichloropropene CH₂Cl°CH═CCl₂ F°1240za 1,1,3°trichloropropeneCHCl₂°CH═CHCl F°1240zd 1,3,3°trichloropropene CCl₃°CH═CH₂ F°1240zf3,3,3°trichloropropene CClF₂°CH═CH₂ F°1242zf3°chloro°3,3°difluoropropene CHClF°CF═CH₂ F°1242yf3°chloro°2,3°difluoropropene CHF₂°CCl═CH₂ F°1242xf2°chloro°3,3°difluoropropene CH₃°CCl═CF₂ F°1242xc2°chloro°1,1°difluoropropene CH₂Cl°CH═CF₂ F°1242zc3°chloro°1,1°difluoropropene CH₂Cl°CF═CHF F°1242ye3°chloro°1,2°difluoropropene CH₂F°CCl═CHF F°1242xe2°chloro°1,3°difluoropropene CHFCl°CH═CHF F°1242ze3°chloro°1,3°difluoropropene CH₂F°CF═CHCl F°1242yd1°chloro°2,3°difluoropropene CHF₂°CH═CHCl F°1242zd1°chloro°3,3°difluoropropene CH₂F°CH═CF₂ F°1243zc 1,1,3°trifluoropropeneCH₃°CF═CF₂ F°1243yc 1,1,2°trifluoropropene CF₃°CH═CH₂ F°1243zf3,3,3°trifluoropropene CH₂F°CF═CHF F°1243ye 1,2,3°trifluoropropeneCHF₂°CF═CH₂ F°1243yf 2,3,3°trifluoropropene CHF₂°CH═CHF F°1243ze1,3,3°trifluoropropene CH₃°CH═CCl₂ F°1250za 1,1°dichloropropeneCH₃°CCl═CHCl F°1250xd 1,2°dichloropropene CH₂Cl°CCl═CH₂ F°1250xf2,3°dichloropropene CH₂Cl°CH═CHCl F°1250zd 1,3°dichloropropeneCHCl₂°CH═CH₂ F°1250zf 3,3°dichloropropene CH₃°CH═CF₂ F°1252zc1,1°difluoropropene CH₃°CF═CHF F°1252ye 1,2°difluoropropene CH₂F°CF═CH₂F°1252yf 2,3°difluoropropene CHF₂°CH═CH₂ F°1252zf 3,3°difluoropropeneCH₃°CCl═CH₂ F°1260xf 2°cloropropene CH₃°CH═CHCl F°1260zd 1°cloropropeneCH₂Cl°CH═CH₂ F°1260zf 3°cloropropene

When the above compounds exist in the form of two cis and trans isomers,the name of the compound (for example Fº1234ze) denotes, withoutpreference, one or the other form or a mixture of the two forms, and themaximum contents indicated are then total contents with respect to thetwo possible formsº except when the form is clarified by the letter E orZ.

Moreover, the name “Fº220” generically denotes all of theheptachloropropane compounds, the name “Fº230” generically denotes allof the hexachloropropane compounds, and so on, using the notations ofthe above table without the final two letters.

Compositions According to the Invention

The invention proposes compositions based on Fº240fa. The content ofFº240fa is greater than or equal to 99%.

According to certain embodiments, it is greater than or equal to 99.1%,or to 99.2%, or to 99.3%, or to 99.4%, or to 99.5%, or to 99.6%, or to99.7%, or to 99.8%, or to 99.9%, or to 99.95%. The compositionsaccording to the invention also comprise at least one compound chosenfrom a list of additional compounds which is constituted by the seriesFº220, Fº230, Fº240 (with the exception of Fº240fa), Fº250, Fº260, Fº270and by the series Fº1210, Fº1220, Fº1230 (with the exception of Fº1230zaand Fº1230zd, which may optionally be present in larger amounts),Fº1240, Fº1250 and Fº1260, said compound being present in thecomposition in a content of less than or equal to 500 ppm; or less thanor equal to 450 ppm; or less than or equal to 400 ppm; or less than orequal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm.

Said at least one compound may be present in a content of greater thanor equal to 1 ppm, or greater than or equal to 2 ppm, or greater than orequal to 3 ppm, or greater than or equal to 5 ppm.

For example, said at least one compound may be present in a content offrom 1 to 5 ppm; or in a content of from 5 to 10 ppm; or in a content offrom 10 to 25 ppm; or in a content of from 25 to 50 ppm; or in a contentof from 50 to 75 ppm; or in a content of from 75 to 100 ppm; or in acontent of from 100 to 150 ppm; or in a content of from 150 to 200 ppm;or in a content of from 200 to 250 ppm; or in a content of from 250 to300 ppm; or in a content of from 300 to 350 ppm; or in a content of from350 to 400 ppm; or in a content of from 400 to 450 ppm; or in a contentof from 450 to 500 ppm.

One embodiment relates to such compositions which comprise a plurality(two, three, four or more than four) compounds chosen from the list ofadditional compounds above, the content of each of said compounds beingless than or equal to 500 ppm; or less than or equal to 450 ppm; or lessthan or equal to 400 ppm; or less than or equal to 350 ppm; or less thanor equal to 300 ppm; or less than or equal to 250 ppm; or less than orequal to 200 ppm; or less than or equal to 150 ppm; or less than orequal to 100 ppm; or less than or equal to 75 ppm; or less than or equalto 50 ppm; or less than or equal to 25 ppm; or less than or equal to 10ppm; or less than or equal to 5 ppm.

Each compound of this plurality may then be present in a content ofgreater than or equal to 1 ppm, or greater than or equal to 2 ppm, orgreater than or equal to 3 ppm, or greater than or equal to 5 ppm.

For example, each compound of this plurality may be present in a contentof from 1 to 5 ppm; or in a content of from 5 to 10 ppm; or in a contentof from 10 to 25 ppm; or in a content of from 25 to 50 ppm; or or in acontent of from 50 to 75 ppm; or in a content of from 75 to 100 ppm; orin a content of from 100 to 150 ppm; or in a content of from 150 to 200ppm; or in a content of from 200 to 250 ppm; or in a content of from 250to 300 ppm; or in a content of from 300 to 350 ppm; or in a content offrom 350 to 400 ppm; or in a content of from 400 to 450 ppm; or in acontent of from 450 to 500 ppm.

One embodiment relates to such compositions in which the content of eachof the compounds of the list of additional compounds above optionallypresent in the composition is less than or equal to 500 ppm; or lessthan or equal to 450 ppm; or less than or equal to 400 ppm; or less thanor equal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm.

Each compound of the list of additional compounds may then be present ina content of greater than or equal to 1 ppm, or greater than or equal to2 ppm, or greater than or equal to 3 ppm, or greater than or equal to 5ppm.

For example, each compound of the list of additional compounds may bepresent in a content of from 1 to 5 ppm; or in a content of from 5 to 10ppm; or in a content of 10 to 25 ppm; or in a content of 25 to 50 ppm;or in a content of 50 to 75 ppm; or in a content of 75 to 100 ppm; or ina content of 100 to 150 ppm; or in a content of 150 to 200 ppm; or in acontent of 200 to 250 ppm; or in a content of 250 to 300 ppm; or in acontent of 300 to 350 ppm; or in a content of 350 to 400 ppm; or in acontent of 400 to 450 ppm; or in a content of 450 to 500 ppm.

The compositions according to the invention may especially comprise oneor more compounds of the series Fº220, each being present in thecomposition in a content of less than or equal to 500 ppm; or less thanor equal to 450 ppm; or less than or equal to 400 ppm; or less than orequal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm; and the total content of compounds of the series Fº220 in thecomposition, preferably, being less than or equal to 500 ppm; or lessthan or equal to 450 ppm; or less than or equal to 400 ppm; or less thanor equal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm.

It should be noted that each compound of the series Fº220 optionallypresent may then be present in a content of greater than or equal to 1ppm, or greater than or equal to 2 ppm, or greater than or equal to 3ppm, or greater than or equal to 5 ppm. Similarly, the total content ofcompounds of the series Fº220 in the composition may be greater than orequal to 1 ppm, or greater than or equal to 2 ppm, or greater than orequal to 3 ppm, or greater than or equal to 5 ppm.

For example, each compound of the series Fº220 optionally present may bepresent in a content of from 1 to 5 ppm; or in a content of 5 to 10 ppm;or in a content of 10 to 25 ppm; or in a content of 25 to 50 ppm; or ina content of 50 to 75 ppm; or in a content of 75 to 100 ppm; or in acontent of 100 to 150 ppm; or in a content of 150 to 200 ppm; or in acontent of 200 to 250 ppm; or in a content of 250 to 300 ppm; or in acontent of 300 to 350 ppm; or in a content of 350 to 400 ppm; or in acontent of 400 to 450 ppm; or in a content of 450 to 500 ppm.

For example, the total content of compounds of the series Fº220 in thecomposition may be from 1 to 5 ppm; or from 5 to 10 ppm; or from 10 to25 ppm; or from 25 to 50 ppm; or from 50 to 75 ppm; or from 75 to 100ppm; or from 100 to 150 ppm; or from 150 to 200 ppm; or from 200 to 250ppm; or from 250 to 300 ppm; or from 300 to 350 ppm; or from 350 to 400ppm; or from 400 to 450 ppm; or from 450 to 500 ppm.

The compositions according to the invention may especially comprise oneor more compounds of the series Fº230, each being present in thecomposition in a content of less than or equal to 500 ppm; or less thanor equal to 450 ppm; or less than or equal to 400 ppm; or less than orequal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm; and the total content of compounds of the series Fº230 in thecomposition, preferably, being less than or equal to 500 ppm; or lessthan or equal to 450 ppm; or less than or equal to 400 ppm; or less thanor equal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm.

It should be noted that each compound of the series Fº230 optionallypresent may then be present in a content of greater than or equal to 1ppm, or greater than or equal to 2 ppm, or greater than or equal to 3ppm, or greater than or equal to 5 ppm. Similarly, the total content ofcompounds of the series Fº230 in the composition may be greater than orequal to 1 ppm, or greater than or equal to 2 ppm, or greater than orequal to 3 ppm, or greater than or equal to 5 ppm.

For example, each compound of the series Fº230 optionally present may bepresent in a content of from 1 to 5 ppm; or in a content of 5 to 10 ppm;or in a content of 10 to 25 ppm; or in a content of 25 to 50 ppm; or ina content of 50 to 75 ppm; or in a content of 75 to 100 ppm; or in acontent of 100 to 150 ppm; or in a content of 150 to 200 ppm; or in acontent of 200 to 250 ppm; or in a content of 250 to 300 ppm; or in acontent of 300 to 350 ppm; or in a content of 350 to 400 ppm; or in acontent of 400 to 450 ppm; or in a content of 450 to 500 ppm.

For example, the total content of compounds of the series Fº230 in thecomposition may be from 1 to 5 ppm; or from 5 to 10 ppm; or from 10 to25 ppm; or from 25 to 50 ppm; or from 50 to 75 ppm; or from 75 to 100ppm; or from 100 to 150 ppm; or from 150 to 200 ppm; or from 200 to 250ppm; or from 250 to 300 ppm; or from 300 to 350 ppm; or from 350 to 400ppm; or from 400 to 450 ppm; or from 450 to 500 ppm.

The compositions according to the invention may especially comprise oneor more compounds of the series Fº240, each (except for Fº240fa) beingpresent in the composition in a content of less than or equal to 500ppm; or less than or equal to 450 ppm; or less than or equal to 400 ppm;or less than or equal to 350 ppm; or less than or equal to 300 ppm; orless than or equal to 250 ppm; or less than or equal to 200 ppm; or lessthan or equal to 150 ppm; or less than or equal to 100 ppm; or less thanor equal to 75 ppm; or less than or equal to 50 ppm; or less than orequal to 25 ppm; or less than or equal to 10 ppm; or less than or equalto 5 ppm; and the total content of compounds of the series Fº240 (exceptfor Fº240fa) in the composition, preferably, being less than or equal to500 ppm; or less than or equal to 450 ppm; or less than or equal to 400ppm; or less than or equal to 350 ppm; or less than or equal to 300 ppm;or less than or equal to 250 ppm; or less than or equal to 200 ppm; orless than or equal to 150 ppm; or less than or equal to 100 ppm; or lessthan or equal to 75 ppm; or less than or equal to 50 ppm; or less thanor equal to 25 ppm; or less than or equal to 10 ppm; or less than orequal to 5 ppm.

It should be noted that each compound of the series Fº240 (except forFº240fa) optionally present may then be present in a content of greaterthan or equal to 1 ppm, or greater than or equal to 2 ppm, or greaterthan or equal to 3 ppm, or greater than or equal to 5 ppm. Similarly,the total content of compounds of the series Fº240 (except for Fº240fa)in the composition may be greater than or equal to 1 ppm, or greaterthan or equal to 2 ppm, or greater than or equal to 3 ppm, or greaterthan or equal to 5 ppm.

For example, each compound of the series Fº240 (except for Fº240fa)optionally present may be present in a content of 1 to 5 ppm; or in acontent of 5 to 10 ppm; or in a content of 10 to 25 ppm; or in a contentof 25 to 50 ppm; or in a content of 50 to 75 ppm; or in a content of 75to 100 ppm; or in a content of 100 to 150 ppm; or in a content of 150 to200 ppm; or in a content of 200 to 250 ppm; or in a content of 250 to300 ppm; or in a content of 300 to 350 ppm; or in a content of 350 to400 ppm; or in a content of 400 to 450 ppm; or in a content of 450 to500 ppm.

For example, the total content of compounds of the series Fº240 (exceptfor Fº240fa) in the composition may be from 1 to 5 ppm; or from 5 to 10ppm; or from 10 to 25 ppm; or from 25 to 50 ppm; or from 50 to 75 ppm;or from 75 to 100 ppm; or from 100 to 150 ppm; or from 150 to 200 ppm;or from 200 to 250 ppm; or from 250 to 300 ppm; or from 300 to 350 ppm;or from 350 to 400 ppm; or from 400 to 450 ppm; or from 450 to 500 ppm.

Fº240fa may be present in an amount markedly higher than those listedabove.

The compositions according to the invention may especially comprise oneor more compounds of the series Fº250, each being present in thecomposition in a content of less than or equal to 500 ppm; or less thanor equal to 450 ppm; or less than or equal to 400 ppm; or less than orequal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm; and the total content of compounds of the series Fº250 in thecomposition, preferably, being less than or equal to 500 ppm; or lessthan or equal to 450 ppm; or less than or equal to 400 ppm; or less thanor equal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm.

It should be noted that each compound of the series Fº250 optionallypresent may then be present in a content of greater than or equal to 1ppm, or greater than or equal to 2 ppm, or greater than or equal to 3ppm, or greater than or equal to 5 ppm. Similarly, the total content ofcompounds of the series Fº250 in the composition may be greater than orequal to 1 ppm, or greater than or equal to 2 ppm, or greater than orequal to 3 ppm, or greater than or equal to 5 ppm.

For example, each compound of the series Fº250 optionally present may bepresent in a content of from 1 to 5 ppm; or in a content of 5 to 10 ppm;or in a content of 10 to 25 ppm; or in a content of 25 to 50 ppm; or ina content of 50 to 75 ppm; or in a content of 75 to 100 ppm; or in acontent of 100 to 150 ppm; or in a content of 150 to 200 ppm; or in acontent of 200 to 250 ppm; or in a content of 250 to 300 ppm; or in acontent of 300 to 350 ppm; or in a content of 350 to 400 ppm; or in acontent of 400 to 450 ppm; or in a content of 450 to 500 ppm.

For example, the total content of compounds of the series Fº250 in thecomposition may be from 1 to 5 ppm; or from 5 to 10 ppm; or from 10 to25 ppm; or from 25 to 50 ppm; or from 50 to 75 ppm; or from 75 to 100ppm; or from 100 to 150 ppm; or from 150 to 200 ppm; or from 200 to 250ppm; or from 250 to 300 ppm; or from 300 to 350 ppm; or from 350 to 400ppm; or from 400 to 450 ppm; or from 450 to 500 ppm.

The compositions according to the invention may especially comprise oneor more compounds of the series Fº260, each being present in thecomposition in a content of less than or equal to 500 ppm; or less thanor equal to 450 ppm; or less than or equal to 400 ppm; or less than orequal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm; and the total content of compounds of the series Fº260 in thecomposition, preferably, being less than or equal to 500 ppm; or lessthan or equal to 450 ppm; or less than or equal to 400 ppm; or less thanor equal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm.

It should be noted that each compound of the series Fº260 optionallypresent may then be present in a content of greater than or equal to 1ppm, or greater than or equal to 2 ppm, or greater than or equal to 3ppm, or greater than or equal to 5 ppm. Similarly, the total content ofcompounds of the series Fº260 in the composition may be greater than orequal to 1 ppm, or greater than or equal to 2 ppm, or greater than orequal to 3 ppm, or greater than or equal to 5 ppm.

For example, each compound of the series Fº260 optionally present may bepresent in a content of from 1 to 5 ppm; or in a content of 5 to 10 ppm;or in a content of 10 to 25 ppm; or in a content of 25 to 50 ppm; or ina content of 50 to 75 ppm; or in a content of 75 to 100 ppm; or in acontent of 100 to 150 ppm; or in a content of 150 to 200 ppm; or in acontent of 200 to 250 ppm; or in a content of 250 to 300 ppm; or in acontent of 300 to 350 ppm; or in a content of 350 to 400 ppm; or in acontent of 400 to 450 ppm; or in a content of 450 to 500 ppm.

For example, the total content of compounds of the series Fº260 in thecomposition may be from 1 to 5 ppm; or from 5 to 10 ppm; or from 10 to25 ppm; or from 25 to 50 ppm; or from 50 to 75 ppm; or from 75 to 100ppm; or from 100 to 150 ppm; or from 150 to 200 ppm; or from 200 to 250ppm; or from 250 to 300 ppm; or from 300 to 350 ppm; or from 350 to 400ppm; or from 400 to 450 ppm; or from 450 to 500 ppm.

The compositions according to the invention may especially comprise oneor more compounds of the series Fº270, each being present in thecomposition in a content of less than or equal to 500 ppm; or less thanor equal to 450 ppm; or less than or equal to 400 ppm; or less than orequal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm; and the total content of compounds of the series Fº270 in thecomposition, preferably, being less than or equal to 500 ppm; or lessthan or equal to 450 ppm; or less than or equal to 400 ppm; or less thanor equal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm.

It should be noted that each compound of the series Fº270 optionallypresent may then be present in a content of greater than or equal to 1ppm, or greater than or equal to 2 ppm, or greater than or equal to 3ppm, or greater than or equal to 5 ppm. Similarly, the total content ofcompounds of the series Fº270 in the composition may be greater than orequal to 1 ppm, or greater than or equal to 2 ppm, or greater than orequal to 3 ppm, or greater than or equal to 5 ppm.

For example, each compound of the series Fº270 optionally present may bepresent in a content of from 1 to 5 ppm; or in a content of 5 to 10 ppm;or in a content of 10 to 25 ppm; or in a content of 25 to 50 ppm; or ina content of 50 to 75 ppm; or in a content of 75 to 100 ppm; or in acontent of 100 to 150 ppm; or in a content of 150 to 200 ppm; or in acontent of 200 to 250 ppm; or in a content of 250 to 300 ppm; or in acontent of 300 to 350 ppm; or in a content of 350 to 400 ppm; or in acontent of 400 to 450 ppm; or in a content of 450 to 500 ppm.

For example, the total content of compounds of the series Fº270 in thecomposition may be from 1 to 5 ppm; or from 5 to 10 ppm; or from 10 to25 ppm; or from 25 to 50 ppm; or from 50 to 75 ppm; or from 75 to 100ppm; or from 100 to 150 ppm; or from 150 to 200 ppm; or from 200 to 250ppm; or from 250 to 300 ppm; or from 300 to 350 ppm; or from 350 to 400ppm; or from 400 to 450 ppm; or from 450 to 500 ppm.

The compositions according to the invention may especially compriseFº1210xa in a content of less than or equal to 500 ppm; or less than orequal to 450 ppm; or less than or equal to 400 ppm; or less than orequal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm.

It should be noted that Fº1210xa may then be present in a content ofgreater than or equal to 1 ppm, or greater than or equal to 2 ppm, orgreater than or equal to 3 ppm, or greater than or equal to 5 ppm.

For example, Fº1210xa may be present in a content of from 1 to 5 ppm; orin a content of 5 to 10 ppm; or in a content of 10 to 25 ppm; or in acontent of 25 to 50 ppm; or in a content of 50 to 75 ppm; or in acontent of 75 to 100 ppm; or in a content of 100 to 150 ppm; or in acontent of 150 to 200 ppm; or in a content of 200 to 250 ppm; or in acontent of 250 to 300 ppm; or in a content of 300 to 350 ppm; or in acontent of 350 to 400 ppm; or in a content of 400 to 450 ppm; or in acontent of 450 to 500 ppm.

The compositions according to the invention may especially comprise oneor more compounds of the series Fº1220, each being present in thecomposition in a content of less than or equal to 500 ppm; or less thanor equal to 450 ppm; or less than or equal to 400 ppm; or less than orequal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm; and the total content of compounds of the series Fº1220 in thecomposition, preferably, being less than or equal to 500 ppm; or lessthan or equal to 450 ppm; or less than or equal to 400 ppm; or less thanor equal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm.

It should be noted that each compound of the series Fº1220 optionallypresent may then be present in a content of greater than or equal to 1ppm, or greater than or equal to 2 ppm, or greater than or equal to 3ppm, or greater than or equal to 5 ppm. Similarly, the total content ofcompounds of the series Fº1220 in the composition may be greater than orequal to 1 ppm, or greater than or equal to 2 ppm, or greater than orequal to 3 ppm, or greater than or equal to 5 ppm.

For example, each compound of the series Fº1220 optionally present maybe present in a content of from 1 to 5 ppm; or in a content of 5 to 10ppm; or in a content of 10 to 25 ppm; or in a content of 25 to 50 ppm;or in a content of 50 to 75 ppm; or in a content of 75 to 100 ppm; or ina content of 100 to 150 ppm; or in a content of 150 to 200 ppm; or in acontent of 200 to 250 ppm; or in a content of 250 to 300 ppm; or in acontent of 300 to 350 ppm; or in a content of 350 to 400 ppm; or in acontent of 400 to 450 ppm; or in a content of 450 to 500 ppm.

For example, the total content of compounds of the series Fº1220 in thecomposition may be from 1 to 5 ppm; or from 5 to 10 ppm; or from 10 to25 ppm; or from 25 to 50 ppm; or from 50 to 75 ppm; or from 75 to 100ppm; or from 100 to 150 ppm; or from 150 to 200 ppm; or from 200 to 250ppm; or from 250 to 300 ppm; or from 300 to 350 ppm; or from 350 to 400ppm; or from 400 to 450 ppm; or from 450 to 500 ppm.

The compositions according to the invention may especially comprise oneor more compounds of the series Fº1230 (with the exception of Fº1230zaand Fº1230zd, which may optionally be present in larger amounts), eachbeing present in the composition in a content of less than or equal to500 ppm; or less than or equal to 450 ppm; or less than or equal to 400ppm; or less than or equal to 350 ppm; or less than or equal to 300 ppm;or less than or equal to 250 ppm; or less than or equal to 200 ppm; orless than or equal to 150 ppm; or less than or equal to 100 ppm; or lessthan or equal to 75 ppm; or less than or equal to 50 ppm; or less thanor equal to 25 ppm; or less than or equal to 10 ppm; or less than orequal to 5 ppm; and the total content of compounds of the series Fº1230(except for Fº1230za and Fº1230zd) in the composition, preferably, beingless than or equal to 500 ppm; or less than or equal to 450 ppm; or lessthan or equal to 400 ppm; or less than or equal to 350 ppm; or less thanor equal to 300 ppm; or less than or equal to 250 ppm; or less than orequal to 200 ppm; or less than or equal to 150 ppm; or less than orequal to 100 ppm; or less than or equal to 75 ppm; or less than or equalto 50 ppm; or less than or equal to 25 ppm; or less than or equal to 10ppm; or less than or equal to 5 ppm.

It should be noted that each compound of the series Fº1230 (except forFº1230za and Fº1230zd) optionally present may then be present in acontent of greater than or equal to 1 ppm, or greater than or equal to 2ppm, or greater than or equal to 3 ppm, or greater than or equal to 5ppm. Similarly, the total content of compounds of the series Fº1230(except for Fº1230za and Fº1230zd) in the composition may be greaterthan or equal to 1 ppm, or greater than or equal to 2 ppm, or greaterthan or equal to 3 ppm, or greater than or equal to 5 ppm.

For example, each compound of the series Fº1230 (except for Fº1230za andFº1230zd) optionally present may be present in a content of from 1 to 5ppm; or in a content of 5 to 10 ppm; or in a content of 10 to 25 ppm; orin a content of 25 to 50 ppm; or in a content of 50 to 75 ppm; or in acontent of 75 to 100 ppm; or in a content of 100 to 150 ppm; or in acontent of 150 to 200 ppm; or in a content of 200 to 250 ppm; or in acontent of 250 to 300 ppm; or in a content of 300 to 350 ppm; or in acontent of 350 to 400 ppm; or in a content of 400 to 450 ppm; or in acontent of 450 to 500 ppm.

For example, the total content of compounds of the series Fº1230 (exceptfor Fº1230za and Fº1230zd) in the composition may be from 1 to 5 ppm; orfrom 5 to 10 ppm; or from 10 to 25 ppm; or from 25 to 50 ppm; or from 50to 75 ppm; or from 75 to 100 ppm; or from 100 to 150 ppm; or from 150 to200 ppm; or from 200 to 250 ppm; or from 250 to 300 ppm; or from 300 to350 ppm; or from 350 to 400 ppm; or from 400 to 450 ppm; or from 450 to500 ppm.

Fº1230za and Fº1230zd may be present in amounts markedly higher thanthose listed above. These compounds are precursors of Fº1234ze.

The compositions according to the invention may especially comprise oneor more compounds of the series Fº1240, each being present in thecomposition in a content of less than or equal to 500 ppm; or less thanor equal to 450 ppm; or less than or equal to 400 ppm; or less than orequal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm; and the total content of compounds of the series Fº1240 in thecomposition, preferably, being less than or equal to 500 ppm; or lessthan or equal to 450 ppm; or less than or equal to 400 ppm; or less thanor equal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm.

It should be noted that each compound of the series Fº1240 optionallypresent may then be present in a content of greater than or equal to 1ppm, or greater than or equal to 2 ppm, or greater than or equal to 3ppm, or greater than or equal to 5 ppm. Similarly, the total content ofcompounds of the series Fº1240 in the composition may be greater than orequal to 1 ppm, or greater than or equal to 2 ppm, or greater than orequal to 3 ppm, or greater than or equal to 5 ppm.

For example, each compound of the series Fº1240 optionally present maybe present in a content of from 1 to 5 ppm; or in a content of 5 to 10ppm; or in a content of 10 to 25 ppm; or in a content of 25 to 50 ppm;or in a content of 50 to 75 ppm; or in a content of 75 to 100 ppm; or ina content of 100 to 150 ppm; or in a content of 150 to 200 ppm; or in acontent of 200 to 250 ppm; or in a content of 250 to 300 ppm; or in acontent of 300 to 350 ppm; or in a content of 350 to 400 ppm; or in acontent of 400 to 450 ppm; or in a content of 450 to 500 ppm.

For example, the total content of compounds of the series Fº1240 in thecomposition may be from 1 to 5 ppm; or from 5 to 10 ppm; or from 10 to25 ppm; or from 25 to 50 ppm; or from 50 to 75 ppm; or from 75 to 100ppm; or from 100 to 150 ppm; or from 150 to 200 ppm; or from 200 to 250ppm; or from 250 to 300 ppm; or from 300 to 350 ppm; or from 350 to 400ppm; or from 400 to 450 ppm; or from 450 to 500 ppm.

The compositions according to the invention may especially comprise oneor more compounds of the series Fº1250, each being present in thecomposition in a content of less than or equal to 500 ppm; or less thanor equal to 450 ppm; or less than or equal to 400 ppm; or less than orequal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm; and the total content of compounds of the series Fº1250 in thecomposition, preferably, being less than or equal to 500 ppm; or lessthan or equal to 450 ppm; or less than or equal to 400 ppm; or less thanor equal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm.

It should be noted that each compound of the series Fº1250 optionallypresent may then be present in a content of greater than or equal to 1ppm, or greater than or equal to 2 ppm, or greater than or equal to 3ppm, or greater than or equal to 5 ppm. Similarly, the total content ofcompounds of the series Fº1250 in the composition may be greater than orequal to 1 ppm, or greater than or equal to 2 ppm, or greater than orequal to 3 ppm, or greater than or equal to 5 ppm.

For example, each compound of the series Fº1250 optionally present maybe present in a content of from 1 to 5 ppm; or in a content of 5 to 10ppm; or in a content of 10 to 25 ppm; or in a content of 25 to 50 ppm;or in a content of 50 to 75 ppm; or in a content of 75 to 100 ppm; or ina content of 100 to 150 ppm; or in a content of 150 to 200 ppm; or in acontent of 200 to 250 ppm; or in a content of 250 to 300 ppm; or in acontent of 300 to 350 ppm; or in a content of 350 to 400 ppm; or in acontent of 400 to 450 ppm; or in a content of 450 to 500 ppm.

For example, the total content of compounds of the series Fº1250 in thecomposition may be from 1 to 5 ppm; or from 5 to 10 ppm; or from 10 to25 ppm; or from 25 to 50 ppm; or from 50 to 75 ppm; or from 75 to 100ppm; or from 100 to 150 ppm; or from 150 to 200 ppm; or from 200 to 250ppm; or from 250 to 300 ppm; or from 300 to 350 ppm; or from 350 to 400ppm; or from 400 to 450 ppm; or from 450 to 500 ppm.

The compositions according to the invention may especially comprise oneor more compounds of the series Fº1260, each being present in thecomposition in a content of less than or equal to 500 ppm; or less thanor equal to 450 ppm; or less than or equal to 400 ppm; or less than orequal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm; and the total content of compounds of the series Fº1260 in thecomposition, preferably, being less than or equal to 500 ppm; or lessthan or equal to 450 ppm; or less than or equal to 400 ppm; or less thanor equal to 350 ppm; or less than or equal to 300 ppm; or less than orequal to 250 ppm; or less than or equal to 200 ppm; or less than orequal to 150 ppm; or less than or equal to 100 ppm; or less than orequal to 75 ppm; or less than or equal to 50 ppm; or less than or equalto 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5ppm.

It should be noted that each compound in the series Fº1260 optionallypresent may then be present in a content of greater than or equal to 1ppm, or greater than or equal to 2 ppm, or greater than or equal to 3ppm, or greater than or equal to 5 ppm. Similarly, the total content ofcompounds of the series Fº1260 in the composition may be greater than orequal to 1 ppm, or greater than or equal to 2 ppm, or greater than orequal to 3 ppm, or greater than or equal to 5 ppm.

For example, each compound of the series Fº1260 optionally present maybe present in a content of 1 to 5 ppm; or in a content of 5 to 10 ppm;or in a content of 10 to 25 ppm; or in a content of 25 to 50 ppm; or ina content of 50 to 75 ppm; or in a content of 75 to 100 ppm; or in acontent of 100 to 150 ppm; or in a content of 150 to 200 ppm; or in acontent of 200 to 250 ppm; or in a content of 250 to 300 ppm; or in acontent of 300 to 350 ppm; or in a content of 350 to 400 ppm; or in acontent of 400 to 450 ppm; or in a content of 450 to 500 ppm.

For example, the total content of compounds of the series Fº1260 in thecomposition may be from 1 to 5 ppm; or from 5 to 10 ppm; or from 10 to25 ppm; or from 25 to 50 ppm; or from 50 to 75 ppm; or from 75 to 100ppm; or from 100 to 150 ppm; or from 150 to 200 ppm; or from 200 to 250ppm; or from 250 to 300 ppm; or from 300 to 350 ppm; or from 350 to 400ppm; or from 400 to 450 ppm; or from 450 to 500 ppm.

Impurities that are particularly undesirable as a mixture with Fº1233zdEare:

-   -   the molecules of the series Fº1215 and particularly Fº1215xc and        Fº1215yc;    -   the molecules of the series Fº1224 and particularly Fº1224yc,        Fº1224zc and Fº1224ye;    -   the molecules of the series Fº1233 other than Fº1233zdE, and        particularly Fº1233xf, Fº1233xc and Fº1233yc;    -   the molecules of the series Fº1242 and particularly Fº1242zf.

The molecules Fº1215xc, Fº1215yb and Fº1215yc have similar boilingpoints to Fº1233zdE and are thus difficult to separate from it.

Due to their reactivity, the molecules that bear a group ═CF₂ also haverisks of toxicological effects. This concerns Fº1215xc and Fº1215ycamong the molecules mentioned above.

Consequently, it is desirable to adjust the compositions according tothe invention so as to limit the presence of precursors of compounds ofthe series Fº1215 (and especially precursors of Fº1215xc and Fº1215yc)therein.

Possible precursors of Fº1215xc and Fº1215yc by fluorination reactionare Fº1210xa, Fº220da (via Fº1210xa) and Fº220aa (via Fº1210xa).

Thus, advantageous compositions according to the invention:

-   -   comprise at least one compound from among those of the series        Fº1210 and Fº220, in a content: less than or equal to 250 ppm;        or from 150 to 200 ppm; or from 100 to 150 ppm; or from 50 to        100 ppm; or from 25 to 50 ppm; or from 10 to 25 ppm; or from 5        to 10 ppm; or less than or equal to 5 ppm, and for example from        1 to 5 ppm; or else    -   comprise one or more compounds from among those of the series        Fº1210 and Fº220, the total content of all these compounds        being: less than or equal to 250 ppm; or from 150 to 200 ppm; or        from 100 to 150 ppm; or from 50 to 100 ppm; or from 25 to 50        ppm; or from 10 to 25 ppm; or from 5 to 10 ppm; or less than or        equal to 5 ppm, and for example from 1 to 5 ppm; or else    -   comprise at least one compound from among Fº1210xa, Fº220da and        Fº220aa, in a content: less than or equal to 250 ppm; or from        150 to 200 ppm; or from 100 to 150 ppm; or from 50 to 100 ppm;        or from 25 to 50 ppm; or from 10 to 25 ppm; or from 5 to 10 ppm;        or less than or equal to 5 ppm, and for example from 1 to 5 ppm;        or else    -   comprise one or more compounds from among Fº1210xa, Fº220da and        Fº220aa, the total content of all these compounds being: less        than or equal to 250 ppm; or from 150 to 200 ppm; or from 100 to        150 ppm; or from 50 to 100 ppm; or from 25 to 50 ppm; or from 10        to 25 ppm; or from 5 to 10 ppm; or less than or equal to 5 ppm,        and for example from 1 to 5 ppm.

Other possible precursors of Fº1215xc and Fº1215yc by chlorofluorinationreaction (given that Fº1233zdE may be manufactured by fluorination inthe presence of chlorine in the gas phase) are the compounds of theseries Fº1220, Fº1230, Fº1240, Fº1250 and Fº1260.

Thus, advantageous compositions according to the invention:

-   -   comprise at least one compound from among those of the series        Fº1220, Fº1230 (except for Fº1230za and Fº1230zd), Fº1240,        Fº1250 and Fº1260, in a content: less than or equal to 250 ppm;        or from 150 to 200 ppm; or from 100 to 150 ppm; or from 50 to        100 ppm; or from 25 to 50 ppm; or from 10 to 25 ppm; or from 5        to 10 ppm; or less than or equal to 5 ppm, and for example from        1 to 5 ppm; or else    -   comprise one or more compounds from among those of the series        Fº1220, r 1230 (except for Fº1230za and Fº1230zd), Fº1240,        Fº1250 and Fº1260, the total content of all these compounds        being: less than or equal to 250 ppm; or from 150 to 200 ppm; or        from 100 to 150 ppm; or from 50 to 100 ppm; or from 25 to 50        ppm; or from 10 to 25 ppm; or from 5 to 10 ppm; or less than or        equal to 5 ppm, and for example from 1 to 5 ppm.

Yet other advantageous compositions according to the invention:

-   -   comprise at least one compound from among those of the series        Fº1210, Fº1220, Fº1230 (except for Fº1230za and Fº1230zd),        Fº1240, Fº1250, Fº1260 and Fº220, in a content: less than or        equal to 250 ppm; or from 150 to 200 ppm; or from 100 to 150        ppm; or from 50 to 100 ppm; or from 25 to 50 ppm; or from 10 to        25 ppm; or from 5 to 10 ppm; or less than or equal to 5 ppm, and        for example from 1 to 5 ppm; or else    -   comprise one or more compounds from among those of the series        Fº1210, Fº1220, Fº1230 (except for Fº1230za and Fº1230zd),        Fº1240, Fº1250, Fº1260 and Fº220, the total content of all these        compounds being: less than or equal to 250 ppm; or from 150 to        200 ppm; or from 100 to 150 ppm; or from 50 to 100 ppm; or from        25 to 50 ppm; or from 10 to 25 ppm; or from 5 to 10 ppm; or less        than or equal to 5 ppm, and for example from 1 to 5 ppm.

Fº1230za and Fº1230zd may be present in amounts markedly higher thanthose listed above.

The molecules Fº1224xe, Fº1224yd, Fº1224ye, Fº1224zb and Fº1224zc alsohave similar boiling points to Fº1233zdE and are thus difficult toseparate from it. Due to their reactivity, the molecules that bear a═CF₂ group also have risks of toxicological effects. This concernsFº1224yc and Fº1224zc among the molecules mentioned above. In addition,the compound Fº1224ye may result, by successive fluorination, in thecompound Fº1225ye, which is also known for its toxicity.

Consequently, it is desirable to adjust the compositions according tothe invention so as to limit the presence of precursors of compounds ofthe series Fº1224 (and especially of precursors of Fº1224yc, Fº1224zcand Fº1224ye) in them.

Possible precursors of Fº1224yc by fluorination reaction are Fº1220xa,Fº230aa (via Fº1220xa) and Fº230da (via Fº1220xa).

Possible precursors of Fº1224zc by fluorination reaction are Fº1220za,Fº230fa (via Fº1220za) and Fº230da (via Fº1220za).

Possible precursors of Fº1224ye by fluorination reaction are Fº1220xd,Fº230da (via Fº1220xd) and Fº230ab (via Fº1220xd).

Thus, advantageous compositions according to the invention:

-   -   comprise at least one compound from among those of the series        Fº1220 and Fº230, in a content: less than or equal to 250 ppm;        or from 150 to 200 ppm; or from 100 to 150 ppm; or from 50 to        100 ppm; or from 25 to 50 ppm; or from 10 to 25 ppm; or from 5        to 10 ppm; or less than or equal to 5 ppm, and for example from        1 to 5 ppm; or else    -   comprise one or more compounds from among those of the series        Fº1220 and Fº230, the total content of all these compounds        being: less than or equal to 250 ppm; or from 150 to 200 ppm; or        from 100 to 150 ppm; or from 50 to 100 ppm; or from 25 to 50        ppm; or from 10 to 25 ppm; or from 5 to 10 ppm; or less than or        equal to 5 ppm, and for example from 1 to 5 ppm; or else    -   comprise at least one compound from among Fº1220xa, Fº1220za,        Fº1220xd, Fº230aa, Fº230fa, Fº230ab and Fº230da, in a content:        less than or equal to 250 ppm; or from 150 to 200 ppm; or from        100 to 150 ppm; or from 50 to 100 ppm; or from 25 to 50 ppm; or        from 10 to 25 ppm; or from 5 to 10 ppm; or less than or equal to        5 ppm, and for example from 1 to 5 ppm; or else    -   comprise one or more compounds from among Fº1220xa, Fº1220za,        Fº1220xd, Fº230aa, Fº230fa, Fº230ab and Fº230da, the total        content of all these compounds being: less than or equal to 250        ppm; or from 150 to 200 ppm; or from 100 to 150 ppm; or from 50        to 100 ppm; or from 25 to 50 ppm; or from 10 to 25 ppm; or from        5 to 10 ppm; or less than or equal to 5 ppm, and for example        from 1 to 5 ppm.

Other possible precursors of Fº1224yc, Fº1224zc and Fº1224ye bychlorofluorination reaction (given that Fº1233zdE may be manufactured byfluorination in the presence of chlorine in the gas phase) are thecompounds of the series Fº1230, Fº1240, Fº1250 and Fº1260.

Thus, advantageous compositions according to the invention:

-   -   comprise at least one compound from among those of the series        Fº1230 (except for Fº1230za and Fº1230zd), Fº1240, Fº1250 and        Fº1260, in a content: less than or equal to 250 ppm; or from 150        to 200 ppm; or from 100 to 150 ppm; or from 50 to 100 ppm; or        from 25 to 50 ppm; or from 10 to 25 ppm; or from 5 to 10 ppm; or        less than or equal to 5 ppm, and for example from 1 to 5 ppm; or        else    -   comprise one or more compounds from among those of the series        Fº1230 (except for Fº1230za and Fº1230zd), Fº1240, Fº1250 and        Fº1260, the total content of all these compounds being: less        than or equal to 250 ppm; or from 150 to 200 ppm; or from 100 to        150 ppm; or from 50 to 100 ppm; or from 25 to 50 ppm; or from 10        to 25 ppm; or from 5 to 10 ppm; or less than or equal to 5 ppm,        and for example from 1 to 5 ppm.

Yet other advantageous compositions according to the invention:

-   -   comprise at least one compound from among those of the series        Fº1220, Fº1230 (except for Fº1230za and Fº1230zd), Fº1240,        Fº1250, Fº1260 and Fº230, in a content: less than or equal to        250 ppm; or from 150 to 200 ppm; or from 100 to 150 ppm; or from        50 to 100 ppm; or from 25 to 50 ppm; or from 10 to 25 ppm; or        from 5 to 10 ppm; or less than or equal to 5 ppm, and for        example from 1 to 5 ppm; or else    -   comprise one or more compounds from among those of the series        Fº1220, r 1230 (except for Fº1230za and Fº1230zd), Fº1240,        Fº1250, Fº1260 and Fº230, the total content of all these        compounds being: less than or equal to 250 ppm; or from 150 to        200 ppm; or from 100 to 150 ppm; or from 50 to 100 ppm; or from        25 to 50 ppm; or from 10 to 25 ppm; or from 5 to 10 ppm; or less        than or equal to 5 ppm, and for example from 1 to 5 ppm.

Fº1230za and Fº1230zd may be present in amounts markedly higher thanthose listed above.

The molecules of the series Fº1233 also have boiling points close tothat of Fº1233zdE and are thus difficult to separate from it.

Now, Fº1233xf has a high tendency to polymerize and may generate alongºchain polymer which may subsequently be deposited in the form ofwhite crystals. It is thus preferable to avoid the presence of thisunstable impurity in the final compound in order to facilitate the useof Fº1233zdE in the desired application.

Furthermore, the molecules Fº1233xc and Fº1233yc bear a ═CF₂ group andmay have a risk of toxicological effect.

Possible precursors of Fº1233xf by fluorination reaction are Fº1230xf,Fº1230xa, Fº240db (via Fº1230xf and/or Fº1230xa), Fº240ab (via Fº1230xf)and Fº240aa (via Fº1230xa).

Possible precursors of Fº1233xc and Fº1233yc by fluorination reactionare Fº1230xa, Fº240db (via Fº1230xa) and Fº240aa (via Fº1230xa).

Thus, advantageous compositions according to the invention:

-   -   comprise at least one compound from among those of the series        Fº1230 (except for Fº1230za and Fº1230zd) and Fº240 (exception        made for Fº240fa), in a content: less than or equal to 250 ppm;        or from 150 to 200 ppm; or from 100 to 150 ppm; or from 50 to        100 ppm; or from 25 to 50 ppm; or from 10 to 25 ppm; or from 5        to 10 ppm; or less than or equal to 5 ppm, and for example from        1 to 5 ppm; or else    -   comprise one or more compounds from among those of the series        Fº1230 (except for Fº1230za and Fº1230zd) and Fº240 (exception        made for Fº240fa), the total content of all these compounds        being: less than or equal to 250 ppm; or from 150 to 200 ppm; or        from 100 to 150 ppm; or from 50 to 100 ppm; or from 25 to 50        ppm; or from 10 to 25 ppm; or from 5 to 10 ppm; or less than or        equal to 5 ppm, and for example from 1 to 5 ppm; or else    -   comprise at least one compound from among Fº1230xf, Fº1230xa,        Fº240db, Fº240ab and Fº240aa, in a content: less than or equal        to 250 ppm; or from 150 to 200 ppm; or from 100 to 150 ppm; or        from 50 to 100 ppm; or from 25 to 50 ppm; or from 10 to 25 ppm;        or from 5 to 10 ppm; or less than or equal to 5 ppm, and for        example from 1 to 5 ppm; or else    -   comprise one or more compounds from among Fº1230xa, Fº240db,        Fº240ab and Fº240aa, the total content of all these compounds        being: less than or equal to 250 ppm; or from 150 to 200 ppm; or        from 100 to 150 ppm; or from 50 to 100 ppm; or from 25 to 50        ppm; or from 10 to 25 ppm; or from 5 to 10 ppm; or less than or        equal to 5 ppm, and for example from 1 to 5 ppm.

Fº240fa, Fº1230za and Fº1230zd may be present in amounts markedly higherthan those listed above.

Other possible precursors of Fº1233xf, Fº1233yc and Fº1233xc bychlorofluorination reaction (given that Fº1233zdE may be manufactured byfluorination in the presence of chlorine in the gas phase) are thecompounds of the series Fº1240, Fº1250 and Fº1260.

Thus, yet other advantageous compositions according to the invention:

-   -   comprise at least one compound from among those of the series        Fº1240, Fº1250 and Fº1260, in a content: less than or equal to        250 ppm; or from 150 to 200 ppm; or from 100 to 150 ppm; or from        50 to 100 ppm; or from 25 to 50 ppm; or from 10 to 25 ppm; or        from 5 to 10 ppm; or less than or equal to 5 ppm, and for        example from 1 to 5 ppm; or else    -   comprise one or more compounds from among those of the series        Fº1230 (except for Fº1230za and Fº1230zd), Fº1240, Fº1250,        Fº1260 and Fº240 (exception made for Fº240fa), the total content        of all these compounds being: less than or equal to 250 ppm; or        from 150 to 200 ppm; or from 100 to 150 ppm; or from 50 to 100        ppm; or from 25 to 50 ppm; or from 10 to 25 ppm; or from 5 to 10        ppm; or less than or equal to 5 ppm, and for example from 1 to 5        ppm.

Fº240fa, Fº1230za and Fº1230zd may be present in amounts markedly higherthan those listed above.

The molecule Fº1242zf also has a boiling point close to that ofFº1233zdE and is thus difficult to separate from it. In point of fact,this compound is liable to form Fº1243zf as successive fluorination,which molecule is undesirable due to its toxicity.

Possible precursors of Fº1242zf by fluorination reaction are Fº1240za,Fº1240zf, Fº250fb (via one of the two preceding compounds), Fº250da (viaFº1240za) and Fº250db (via Fº1240zf).

Thus, advantageous compositions according to the invention:

-   -   comprise at least one compound from among those of the series        Fº1240 and Fº250, in a content: less than or equal to 250 ppm;        or from 150 to 200 ppm; or from 100 to 150 ppm; or from 50 to        100 ppm; or from 25 to 50 ppm; or from 10 to 25 ppm; or from 5        to 10 ppm; or less than or equal to 5 ppm, and for example from        1 to 5 ppm; or else    -   comprise one or more compounds from among those of the series        Fº1240 and Fº250, the total content of all these compounds        being: less than or equal to 250 ppm; or from 150 to 200 ppm; or        from 100 to 150 ppm; or from 50 to 100 ppm; or from 25 to 50        ppm; or from 10 to 25 ppm; or from 5 to 10 ppm; or less than or        equal to 5 ppm, and for example from 1 to 5 ppm; or else    -   comprise at least one compound from among Fº1240za, Fº1240zf,        Fº250fb, Fº250da and Fº250db, in a content: less than or equal        to 250 ppm; or from 150 to 200 ppm; or from 100 to 150 ppm; or        from 50 to 100 ppm; or from 25 to 50 ppm; or from 10 to 25 ppm;        or from 5 to 10 ppm; or less than or equal to 5 ppm, and for        example from 1 to 5 ppm; or else    -   comprise one or more compounds from among Fº1240za, Fº1240zf,        Fº250fb, Fº250da and Fº250db, the total content of all these        compounds being: less than or equal to 250 ppm; or from 150 to        200 ppm; or from 100 to 150 ppm; or from 50 to 100 ppm; or from        25 to 50 ppm; or from 10 to 25 ppm; or from 5 to 10 ppm; or less        than or equal to 5 ppm, and for example from 1 to 5 ppm.

Other possible precursors of Fº1242zf by chlorofluorination reaction(given that r 1233zdE may be manufactured by fluorination in thepresence of chlorine in the gas phase) are the compounds of the seriesFº1250 and Fº1260.

Thus, yet other advantageous compositions according to the invention:

-   -   comprise at least one compound from among those of the series        Fº1250 and Fº1260, in a content: less than or equal to 250 ppm;        or from 150 to 200 ppm; or from 100 to 150 ppm; or from 50 to        100 ppm; or from 25 to 50 ppm; or from 10 to 25 ppm; or from 5        to 10 ppm; or less than or equal to 5 ppm, and for example from        1 to 5 ppm; or else    -   comprise one or more compounds from among those of the series        Fº1240, Fº1250, Fº1260 and Fº250, the total content of all these        compounds being: less than or equal to 250 ppm; or from 150 to        200 ppm; or from 100 to 150 ppm; or from 50 to 100 ppm; or from        25 to 50 ppm; or from 10 to 25 ppm; or from 5 to 10 ppm; or less        than or equal to 5 ppm, and for example from 1 to 5 ppm.

Impurities that are particularly undesirable as a mixture with Fº1234zeEare:

-   -   the molecules of the series Fº1216 and particularly Fº1216yc;    -   the molecules of the series Fº1225 and particularly Fº1225ye and        Fº1225zc;    -   the molecules of the series Fº1243 and particularly Fº1243zf;        and    -   the molecules of the series Fº1234 other than Fº1234zeE and        particularly r 1234yf.

Fº1216yc is toxic and has a boiling point close to that of Fº1234zeE,and is thus difficult to separate from it. Its precursors byfluorination are Fº1215xc and Fº1215yc. The way of preventing thepresence of such compounds has already been described above.

Fº1225ye and Fº1225zc are toxic and have boiling points close to that ofFº1234zeE, and are thus difficult to separate from it. Its precursors byfluorination are Fº1224ye and r 1224zc. The way of preventing thepresence of such compounds has already been described above.

Fº1243zf is toxic and has a boiling point close to that of Fº1234zeE,and is thus difficult to separate from it. Its precursor by fluorinationis Fº1242zf. The way of preventing the presence of this compound hasalready been described above.

Fº1234yf is a substance which should not be present in excessively largeamount in mixture with Fº1234zeE. For example, its content should beless than or equal to 500 ppm. Now, the boiling points of the twocompounds are close, which makes a conventional separation difficult.The precursor of Fº1234yf by fluorination is Fº1233xf. The way ofpreventing the presence of this compound has already been describedabove.

It should be noted that the presence of molecules of the series Fº270may be undesirable insofar as, when a fluorination reaction is carriedout in the gas phase in the presence of chlorine (for the manufacture ofFº1234zeE), these molecules might by chlorinated and fluorinated toproduce some of the undesirable impurities listed above.

Preparation of the Compositions According to the Invention

The manufacture of Fº240fa is known, for example, from U.S. Pat. No.5,705,779. The document proposes a process for the production of Fº240faby:

-   -   reaction of carbon tetrachloride with ethylene to produce        Fº250fb;    -   photochlorination of Fº250fb to obtain Fº1240fa.        The compositions according to the invention may then be obtained        by performing one or more steps of separation of Fº240fa with        respect to the other compounds mentioned above, and especially        with respect to Fº240db (which is in general the majority        byproduct of the chlorination) and also the other byproducts of        chlorination, such as Fº230 and/or Fº220 and/or Fº210.

These separation steps may preferably be performed by conventionalabsorption/washing and distillation. As an alternative to standarddistillation or in combination therewith, it is also possible toenvisage a separation by extractive distillation, physicochemicalseparations on molecular sieves, alumina or active charcoal or amembrane separation.

A first separation is generally performed using a standard distillation(column with plates, column with packing) at atmospheric pressure orunder reduced pressure. The pressure chosen is less than 760 mmHg,preferentially less than 450 mmHg and more preferentially less than 200mmHg. Inherently, the pressure of the column determines the temperatureconditions for a given degree of separation. Fº240fa may be recovered byperforming the distillation at a temperature below 180° C.,preferentially below 160° C. and more preferentially below 130° C. Asimple column or a distillation train may be used. Under chosenconditions, the purity of Fº240fa after distillation reaches a minimumof 99.8%.

A second separation may be performed using adsorption on zeolite oractive charcoal.

The zeolites or active charcoals that may be used in the process forpurifying Fº240fa advantageously have a mean pore size of from 3.4 to 11Å, preferably from 3.4 to 10 Å. If the zeolite or the active charcoalhas a mean pore size of greater than 11 Å, the amount of Fº240faadsorbed increases, whereas if the mean pore size is less than 3.4 Å,the adsorption capacity of the zeolite or of the active charcoal isreduced.

Zeolite preferably has an Si/AI ratio of two or less. If the Si/AI ratioof the zeolite is greater than two, certain impurities are liable to benot selectively adsorbed. The zeolite is preferably at least one elementchosen from the group consisting of 4 A molecular sieves, a 5 Amolecular sieve, a 10× molecular sieve and 13× molecular sieves. Usingthese zeolites, the water content in Fº240fa may also be simultaneouslyreduced.

The zeolite and the active charcoal are preferably used individually forthe purpose of regenerating the adsorbent, but they may also be used asa mixture. The proportions of zeolite and of active charcoal in themixture are not particularly important, but it is preferable to use alarger amount of zeolite, which makes it possible to reduce the watercontent in Fº240fa.

To treat Fº240fa with zeolite and/or active charcoal in the liquidphase, a batch process or a continuous process may be used.Industrially, a process that consists in continuously passing Fº240faover a fixed bed is preferable. The liquid space time velocity (LSTV)may be chosen appropriately as a function of the content of impuritiesto be removed and of the amount of Fº240fa to be treated. In general,the space velocity is preferably from 1 to 50 h^(º1). Industrially, thepurification process may alternately use two adsorption towers.

The treatment temperature of Fº240fa is from 0° C. to 120° C.,preferably from 20° C. to 80° C. If the treatment temperature is greaterthan 120° C., the cost of equipment may increase on account of theheating of the apparatus, whereas if the treatment temperature is below0° C., cooling equipment may be necessary. The pressure is from 0 to 3MPa, preferably from 0 to 1 MPa. If the pressure is greater than 3 MPa,the economic viability may reduce on account of the requirements interms of pressure resistance of the apparatus.

A membrane separation technique may also be performed in addition toadsorption on active charcoal or on zeolite, or as an alternative tothese techniques. Membrane separation may be performed in the gas phaseaccording to a continuous process performed at low pressure, or atreduced pressure. The chosen pressure is less than 5 bar, preferentiallyless than 2 bar and more preferentially below atmospheric pressure. Thechoice of the membrane depends on the properties of the impurities to beseparated from the Fº240fa (difference in solubility, in diffusivity andin permeability). Membrane separation is performed at a temperature thatdepends on the chosen pressure, below 250° C., preferentially below 230°C. and more preferentially below 180° C.

When Fº240fa containing impurities is placed in contact with zeoliteand/or active charcoal in the liquid phase and/or is purified on amembrane in the gas phase under the conditions described above, Fº240dbmay be obtained with a purity of greater than 99.9%.

Manufacture of Fº1233zdE

The compositions according to the invention may be used formanufacturing Fº1233zdE having desired specifications, via one or morefluorination steps.

The fluorination may be a fluorination in the liquid phase such asdescribed in U.S. Pat. No. 8,704,017.

Alternatively and preferably, the fluorination is a catalyticfluorination in the gas phase with HF in the presence of chlorine.

The catalyst used may be, for example, based on a metal comprising atransition metal oxide or a derivative or a halide or an oxyhalide ofsuch a metal. Examples that may be mentioned include FeCl₃, chromiumoxyfluoride, chromium oxides (optionally subjected to fluorinationtreatments), chromium fluorides, and mixtures thereof. Other possiblecatalysts are catalysts supported on charcoal, antimonyºbased catalysts,aluminumºbased catalysts (for example AlF₃ and Al₂O₃, aluminaoxyfluoride and alumina fluoride).

A chromium oxyfluoride, an aluminum fluoride or oxyfluoride, or asupported or unsupported catalyst containing a metal such as Cr, Ni, Fe,Zn, Ti, V, Zr, Mo, Ge, Sn, Pb, Mg, Sb may generally be used.

Reference may be made in this respect to WO 2007/079 431 (on page 7,lines 1º5 and 28º32) and to FR2748473 (on page 4), to which reference isexpressly made.

The catalyst is particularly preferably based on chromium and it is moreparticularly a mixed catalyst comprising chromium.

According to one embodiment, a mixed catalyst comprising chromium andnickel is used. The Cr/Ni mole ratio (on the basis of the metal element)is generally from 0.5 to 5, for example from 0.7 to 2, for exampleabout 1. The catalyst may contain from 0.5 to 20% by weight of chromiumand from 0.5% to 20% by weight of nickel, preferably from 2% to 10% ofeach.

The metal may be present in metallic form or in the form of aderivative, for example an oxide, halide or oxyhalide. These derivativesare preferably obtained by activation of the catalytic metal.

The support is preferably constituted with aluminum, for examplealumina, activated alumina or aluminum derivatives, such as aluminumhalides and aluminum oxyhalides, for example described in U.S. Pat. No.4,902,838, or obtained via the activation process described above.

The catalyst may comprise chromium and nickel in an activated orunactivated form, on a support that has or has not been subjected to anactivation.

Reference may be made to WO 2009/118 628 (especially on page 4, line 30page 7, line 16), to which reference is expressly made herein.

Another preferred embodiment is based on a mixed catalyst containingchromium and at least one element chosen from Mg and Zn. The atomicratio of Mg or Zn/Cr is preferably from 0.01 to 5.

Before its use, the catalyst is preferably subjected to activation withair, oxygen or chlorine and/or with HF.

For example, the catalyst is preferably subjected to activation with airor oxygen and HF at a temperature of from 100 to 500° C., preferablyfrom 250 to 500° C. and more particularly from 300 to 400° C. Theactivation time is preferably from 1 to 200 hours and more particularlyfrom 1 to 50 hours.

This activation may be followed by a final fluorination activation stepin the presence of an oxidizing agent, of HF and of organic compounds.

The HF/organic compounds mole ratio is preferably from 2 to 40 and theoxidizing agent/organic compounds mole ratio is preferably from 0.04 to25. The final activation temperature is preferably from 300 to 400° C.and its duration is preferably from 6 to 100 hours.

The gasºphase fluorination reaction may be performed:

-   -   with an HF/chlorinated compound mole ratio of from 1:1 to 150:1,        preferably from 3:1 to 100:1 and particularly preferably from        5:1 to 50:1;    -   with a Cl₂/chlorinated compound mole ratio of from 0.01:100 to        5:100, preferably from 0.1:100 to 4:100 and more particularly        preferably from 0.5:100 to 3:100;    -   with a contact time of from 1 to 100 s, preferably 1 to 50 s and        more particularly 2 to 40 s (volume of catalyst divided by the        total entering stream, adjusted to the operating temperature and        pressure);    -   at an absolute pressure ranging from 0.1 to 50 bar, preferably        from 0.3 to 15 bar;    -   at a temperature (temperature of the catalytic bed) of from 100        to 500° C., preferably from 150 to 450° C. and more particularly        from 200 to 300° C.

The stream of products obtained from the fluorination may undergosuitable treatments (distillation, washing, etc.) so as to recoverFº1233zdE in purified form and to separate out other compounds present(HCl, unreacted HF, unreacted Fº240fa, and other organic compounds). Oneor more streams may undergo recycling.

Catalyst regeneration steps may also be envisaged, as described, forexample, in WO 2012/098 421 and WO 2012/098 422, to which reference isexpressly made.

The stream of Fº1233zdE obtained, preferably, contains:

-   -   less than 500 ppm, or 250 ppm, or 200 ppm, or 150 ppm, or 100        ppm, or 50 ppm, or 25 ppm, or 10 ppm, or 5 ppm, of Fº1233xf;        and/or    -   less than 500 ppm, or 250 ppm, or 200 ppm, or 150 ppm, or 100        ppm, or 50 ppm, or 25 ppm, or 10 ppm, or 5 ppm, of Fº1242zf;        and/or    -   less than 500 ppm, or 250 ppm, or 200 ppm, or 150 ppm, or 100        ppm, or 50 ppm, or 25 ppm, or 10 ppm, or 5 ppm, of Fº1215yc;        and/or    -   less than 500 ppm, or 250 ppm, or 200 ppm, or 150 ppm, or 100        ppm, or 50 ppm, or 25 ppm, or 10 ppm, or 5 ppm, of Fº1215xc;        and/or    -   less than 500 ppm, or 250 ppm, or 200 ppm, or 150 ppm, or 100        ppm, or 50 ppm, or 25 ppm, or 10 ppm, or 5 ppm, of Fº1224yc;        and/or    -   less than 500 ppm, or 250 ppm, or 200 ppm, or 150 ppm, or 100        ppm, or 50 ppm, or 25 ppm, or 10 ppm, or 5 ppm, of Fº1224ye;        and/or    -   less than 500 ppm, or 250 ppm, or 200 ppm, or 150 ppm, or 100        ppm, or 50 ppm, or 25 ppm, or 10 ppm, or 5 ppm, of Fº1224zc.

Preferably, these contents are obtained on conclusion of thefluorination, without (or before any) step of purification of theproduct stream.

Manufacture of Fº1234zeE

The compositions according to the invention may be used formanufacturing Fº1234zeE having desired specifications, via one or morefluorination steps starting from Fº1233zdE formed in the preceding step.

The fluorination may be a fluorination in the gas phase with HF.

The catalyst used may be, for example, based on a metal comprising atransition metal oxide or a derivative or a halide or an oxyhalide ofsuch a metal. Examples that may be mentioned include FeCl₃, chromiumoxyfluoride, chromium oxides (optionally subjected to fluorinationtreatments), chromium fluorides, and mixtures thereof. Other possiblecatalysts are catalysts supported on charcoal, antimonyºbased catalysts,aluminumºbased catalysts (for example AlF₃ and Al₂O₃, aluminaoxyfluoride and alumina fluoride).

A chromium oxyfluoride, an aluminum fluoride or oxyfluoride, or asupported or unsupported catalyst containing a metal such as Cr, Ni, Fe,Zn, Ti, V, Zr, Mo, Ge, Sn, Pb, Mg, Sb may generally be used.

Reference may be made in this respect to WO 2007/079 431 (on page 7,lines 1º5 and 28º32), to U.S. Pat. No. 5,895,825, to which reference isexpressly made.

The catalyst is particularly preferably based on chromium and it is moreparticularly a mixed catalyst comprising chromium.

According to one embodiment, a mixed catalyst comprising chromium andnickel is used. The Cr/Ni mole ratio (on the basis of the metal element)is generally from 0.5 to 5, for example from 0.7 to 2, for exampleabout 1. The catalyst may contain from 0.5 to 20% by weight of chromiumand from 0.5% to 20% by weight of nickel, preferably from 2% to 10% ofeach.

The metal may be present in metallic form or in the form of aderivative, for example an oxide, halide or oxyhalide. These derivativesare preferably obtained by activation of the catalytic metal.

The support is preferably constituted with aluminum, for examplealumina, activated alumina or aluminum derivatives, such as aluminumhalides and aluminum oxyhalides, for example described in U.S. Pat. No.4,902,838, or obtained via the activation process described above.

The catalyst may comprise chromium and nickel in an activated orunactivated form, on a support that has or has not been subjected to anactivation.

Reference may be made to WO 2009/118 628 (especially on page 4, line 30page 7, line 16), to which reference is expressly made herein.

Another preferred embodiment is based on a mixed catalyst containingchromium and at least one element chosen from Mg and Zn. The atomicratio of Mg or Zn/Cr is preferably from 0.01 to 5.

Before its use, the catalyst is preferably subjected to activation withair, oxygen or chlorine and/or with HF.

For example, the catalyst is preferably subjected to activation with airor oxygen and HF at a temperature of from 100 to 500° C., preferablyfrom 250 to 500° C. and more particularly from 300 to 400° C. Theactivation time is preferably from 1 to 200 hours and more particularlyfrom 1 to 50 hours.

This activation may be followed by a final fluorination activation stepin the presence of an oxidizing agent, of HF and of organic compounds.

The HF/organic compounds mole ratio is preferably from 2 to 40 and theoxidizing agent/organic compounds mole ratio is preferably from 0.04 to25. The final activation temperature is preferably from 300 to 400° C.and its duration is preferably from 6 to 100 hours.

The gasºphase fluorination reaction may be performed:

-   -   with an HF/chlorinated compound mole ratio of from 1:1 to 150:1,        preferably from 1.5:1 to 100:1 and more particularly preferably        from 2:1 to 50:1;    -   with a contact time of from 1 to 100 s, preferably 1 to 50 s and        more particularly 2 to 40 s (volume of catalyst divided by the        total entering stream, adjusted to the operating temperature and        pressure);    -   at an absolute pressure ranging from 0.1 to 50 bar, preferably        from 0.3 to 15 bar;    -   at a temperature (temperature of the catalytic bed) of from 100        to 500° C., preferably from 200 to 450° C. and more particularly        from 250 to 400° C.

The duration of the reaction step is typically from 10 to 2000 hours,preferably from 50 to 500 hours and more particularly from 70 to 300hours.

The oxidizing agent, preferably oxygen, may optionally be added duringthe fluorination reaction. The oxygen/organic compounds mole ratio maybe from 0.0005 to 2, preferably from 0.01 to 1.5. The oxygen may beintroduced in pure form or in the form of air or an oxygen/nitrogenmixture. The oxygen may also be replaced with chlorine.

The stream of products obtained from the fluorination may undergosuitable treatments (distillation, washing, etc.) so as to recoverFº1234zeE in purified form and to separate out other compounds present(HCl, unreacted HF, unreacted Fº240fa, and other organic compounds). Oneor more streams may undergo recycling.

Catalyst regeneration steps may also be envisaged, as described, forexample, in WO 2012/098 421 and WO 2012/098 422, to which reference isexpressly made.

The stream of Fº1234zeE obtained, preferably, contains:

-   -   less than 500 ppm, or 250 ppm, or 200 ppm, or 150 ppm, or 100        ppm, or 50 ppm, or 25 ppm, or 10 ppm, or 5 ppm, of Fº12432f;        and/or    -   less than 500 ppm, or 250 ppm, or 200 ppm, or 150 ppm, or 100        ppm, or 50 ppm, or 25 ppm, or 10 ppm, or 5 ppm, of Fº1225zc;        and/or    -   less than 500 ppm, or 250 ppm, or 200 ppm, or 150 ppm, or 100        ppm, or 50 ppm, or 25 ppm, or 10 ppm, or 5 ppm, of Fº1216yc;        and/or    -   less than 500 ppm, or 250 ppm, or 200 ppm, or 150 ppm, or 100        ppm, or 50 ppm, or 25 ppm, or 10 ppm, or 5 ppm, of Fº12434c;        and/or    -   less than 500 ppm, or 250 ppm, or 200 ppm, or 150 ppm, or 100        ppm, or 50 ppm, or 25 ppm, or 10 ppm, or 5 ppm, of Fº1252zc;        and/or    -   less than 500 ppm, or 250 ppm, or 200 ppm, or 150 ppm, or 100        ppm, or 50 ppm, or 25 ppm, or 10 ppm, or 5 ppm, of Fº1225ye;        and/or    -   less than 500 ppm, or 250 ppm, or 200 ppm, or 150 ppm, or 100        ppm, or 50 ppm, or 25 ppm, or 10 ppm, or 5 ppm, of Fº1234yf.

Preferably, these contents are obtained on conclusion of thefluorination, without (or before any) step of purification of theproduct stream.

EXAMPLES

The following examples illustrate the invention without limiting it.

Example 1: Analysis of Two Compositions Based on Fº240Fa

Two compositions A and B based on Fº240fa, of different purities, areconsidered. The first composition A results from a synthesis and from apurification in the laboratories of the applicant company. The secondcomposition B originates from a commercial supplier, SynquestLaboratories.

The compositions in mol % of these two samples are given in table 1below (after gas chromatography analysis).

TABLE 1 Analysis of compositions A and B Composition A Composition BF°1230za 0.055 0.018 F°250 0.035 0.449 F°240fa 99.58 96.79 C₂Cl₆ 0.0510.239 F°240db 0.157 2.46 Others 0.122 0.044

Example 2: Preparation of the Fluorination Catalyst

343 g of a Grace HSA alumina support, pretreated in the fixed bed at280° C. under a HF/air mixture containing between 5 and 10% of HF, areplaced in a rotary evaporator. The starting alumina is provided in theform of beads with a diameter of between 0.5 and 2 mm. Its specificsurface is approximately 220 m²/g and its pore volume is 1.3 cm³/g.Furthermore, two aqueous solutions are prepared:

-   -   one contains 81 g of methanol and 8 g of water;    -   the other contains 62 g of water, 55 g of chromic acid CrO₃ and        130 g of nickel chloride NiCl₂ (dissolution of the mixture at        50° C. for 2 h30).

The two solutions are introduced simultaneously and gradually onto thealumina support maintained at 40° C. and stirred. After a step ofmaturing under nitrogen, the catalyst is dried under nitrogen, thenunder vacuum at 65° C., and then at approximately 90° C. for six hours.

500 g of impregnated solid are charged to a tubular Inconel reactor. Thecatalyst is first of all dried while flushing with nitrogen at 320° C.,at atmospheric pressure. It is subsequently fluorinated in the presenceof a HF/N₂ (5 to 10% of HF in nitrogen) mixture at 320° C. and then upto 390° C. The HF feed is subsequently cut off. The catalyst is cooledunder nitrogen.

Example 3: GasºPhase Fluorination

The example was carried out using a continuous gasºphase fluorinationpilot plant. This pilot plant comprises a reactor consisting of anInconel tube with an internal diameter of 38 mm and with a length of 500mm, placed vertically in a tubular electric furnace. A thermometer wellwith an external diameter of 6 mm is placed coaxially in the furnace andmakes possible a reading of temperature along the catalytic bed usingfour stage thermocouples.

A coil wound around the reactor and traversed vertically from the bottomupward makes it possible to preheat the reactants before entry into thereactor. A 30 mL layer of corundum above the catalytic bed makes itpossible to provide a homogeneous distribution of the gaseous reactants.A regulating valve makes it possible to maintain the desired pressure.The gas stream at the inlet and the outlet of the reactor is analyzed bygas chromatography.

An appropriate amount of solids described above is introduced into thereactor and then dried overnight in the presence of nitrogen at 250° C.and atmospheric pressure. The dried solid is subsequently activated(still at atmospheric pressure) under a stream comprising nitrogen andanhydrous hydrofluoric acid for 15 minutes before being placed underpure HF at 250° C. The pressure is subsequently very gradually regulateduntil 10 bar absolute are reached. The reactants (the chlorine and thecomposition A) are subsequently introduced. The flow rates fed are suchthat the HF/Fº240fa mole ratio is equal to 20, the Cl₂/Fº240fa moleratio is equal to 0.018 and the contact time is 15 seconds. Thetemperature is maintained at 250° C. The composition of the gas streamexiting from the reactor is analyzed by gas chromatography and is givenin table 1.

The experiment is also repeated under the same operating conditions withthe sample B of Fº240fa containing 2.46% of Fº240db. The composition ofthe gas stream exiting from the reactor is analyzed by gaschromatography and is given in table 2 below in mol %.

TABLE 2 Gas°phase fluorination of compositions based on F°240fa theproduction of F°1233zdE Reaction with the Reaction with the compositionA composition B F°1233zdE 80.2 78.6 F°1233zdZ 12.8 11.7 F°243fa 0.7 0.5F°244fa 2.6 3.1 F°245fa 1.4 2 F°1233xf 0.14 2.12 F°1234zeE 1.9 1.81F°1234zeZ 0.1 0.09 F°1232zd 0.09 0.03 F°1232za 0.07 0.05

Example 4: Demonstration of the Polymerization of Fº1233xf

A 100 mL autoclave equipped with a temperature measurement and with apressure measurement is available. This autoclave is immersed in an oilbath, the temperature of which is regulated. 49.2 g of compound Fº1233xfwith a purity of 99.67% are introduced into the autoclave and thetemperature of the reactor is increased to 56° C. The autogenousrelative pressure is then 2.8 bar. The compound is left at temperaturefor 18 hours. On conclusion of this period, the reactor is brought backto ambient temperature and then depressurized toward a stainless steeltrap cooled in liquid nitrogen. The cold trap is subsequently reduced inpressure and then analyzed: 99.67% of Fº1233xf are obtained. Thecomposition of the product recovered after degassing is identical to thecomposition of the starting material. The visual appearance of thereactor bottom, where an oily film has been deposited, is noted. Theautoclave is subsequently rinsed using a dichloromethane solution, whichis analyzed by liquid chromatography. The analysis reveals the presenceof 1100 ppm of a compound identified by the massspectrometryºchromatography technique: C₉F₉H₆Cl₃, that is to say thetrimer of the compound Fº1233xf.

Example 5: Demonstration of the Polymerization of Fº1233xf in an AcidMedium

Example 4 is repeated with 12.1 g of Fº1233xf brought into the presenceof 41.6 g of HF. The mixture is left under a temperature 79° C. and arelative autogenous pressure of 7.6 bar for 18 hours. The compoundcollected in the cold trap after depressurization, washing in a bubblerand drying still exhibits a purity of 99.67%. Under these operatingconditions, the bottom of the reactor is covered with white crystals.Approximately 1 g of these crystals could be recovered. Analyses byinfrared and by NMR made it possible to identify an oligopolymericcompound consisting of (ºCClCF₃ºCH₂º)_(n) groups.

1. A composition comprising 99% by weight 1,1,1,3,3ºpentachloropropane(240fa) and one or more compound selected from the group consisting ofFº240da, Fº240db, r 240aa, and Fº240ab, said one or more compound beingpresent in the composition in a weight content of less than 500 ppm. 2.The composition of claim 1, further comprising two or more compoundsselected from the group consisting of Fº240da, Fº240db, Fº240aa, andFº240ab, each of said two or more compounds being present in thecomposition in a weight content of less than 500 ppm.
 3. The compositionof claim 2, wherein the collective weight content of the two or morecompounds is less than 500 ppm.
 4. The composition of claim 1, whereinsaid one or more compound is present in the composition in a weightcontent of less than or equal to 250 ppm.
 5. The composition of claim 1,further comprising one or more additional compounds selected from thegroup consisting of dichloropropanes, trichloropropanes,tetrachloropropanes, hexachloropropanes, heptachloropropanes,chloropropenes, dichloropropenes, trichloropropenes,tetrachloropropenes, pentachloropropenes and hexachloropropene, each ofthe one or more additional compounds being present in the composition ina weight content of less than or equal to 500 ppm.
 6. The composition ofclaim 1, further comprising one or more additional compounds selectedfrom the group consisting of dichloropropanes, trichloropropanes,tetrachloropropanes, hexachloropropanes, heptachloropropanes,chloropropenes, dichloropropenes, trichloropropenes,tetrachloropropenes, pentachloropropenes and hexachloropropene, thetotal weight content of all of the additional compounds being less thanor equal to 1000 ppm.
 7. The composition of claim 1, comprising at least99.5% by weight 1,1,1,3,3ºpentachloropropane.
 8. A process for producing1,3,3,3ºtetrafluoropropene, especially in trans form, comprising:providing the composition as claimed in claim 1; and reacting thecomposition with hydrofluoric acid.